Compsopogon caeruleus (Balbis ex C. Agardh) Montagnes, 1846

Lee, Eun-Young & Lee, Soon Jeong Lee and Sang-Rae, 2024, First report of freshwater red alga Compsopogon caeruleus (Compsopogonaceae, Rhodophyta) in Korea, Journal of Species Research 13 (3), pp. 332-339 : 334-336

Compsopogon caeruleus

Compsopogonophyceae G.W. Saunders & Hommersand, 2004 ḝêNjḀŀğ

Compsopogonales Skuja, 1939 flųNjạ (qḛ ṉÿ) Compsopogonaceae F. Schmitz, 1896

flųNjụ (qḛ ṉÿ)

Compsopogon Montagne, 1846 flųNjẃ (qḛ ṉÿ)

Compsopogon caeruleus (Balbis ex C. Agardh) Montagne, 1846 flųNj (qḛ ṉÿ)

Fronds are minute, densely tufted, purple to red, green in color ( Fig. 3A ). Thalli are branched filaments, with the main axis and primary or secondary laterals, up to 8 cm in length ( Fig. 3B ).

The main axial filaments are uniseriate and composed of nodal cells. The branches are thinner than the main axis and become thinner toward the tip. The laterals are occasionally constricted abruptly at the base attached to the node ( Fig. 3C ). The size of the cell is up to 83 - 120 μm in length, 208 - 280 μm in width in axial part, and the 38 - 42 μm in length, 111 - 173 μm in width in primary branches, 13 - 24 μm in length, 44 - 48 μm in width in secondary branches.

The young part of each branch is composed of only axis cells without any cortex and is round at the apex ( Fig. 3D, E ). The main axis is surrounded by a 1 - 2 row cortical layer in the mature part ( Fig. 3F ). Cortex is composed of polygonal cells, 22 - 28 μm in diameter ( Fig. 3G ). Monosporangia are spherical with dense contents, solitary, which are located in cortical layer ( Fig. 3H ).

Specimens examined: NIBRRD0000010748, NIBRRD 0000010749, and NIBRRD0000010750; Gyeonggi-do Yongin-si, Seongbok-dong 410-9; 04 July 2023 .

Accession numbers: PP471840 (18S rDNA), PP477321 (rbc L), and PP477322 (cox 1) (sequences derived from NIBRRD0000010748).

Basonym: Conferva caerulea Balbis ex C. Agardh 1824 .

Synonyms:

Compsopogon aegyptiacus Aleem 1981 ; Compsopogon aeruginosus (J. Agardh) Kützing, 1849: 433 ; Compsopogon chalybeus Kützing 1849 ; Compsopogon corticrassus Chihara and Nakamura 1980: 136 ; Compsopogon hoohri Montagne 1846: 157 ; Compsopogon iyengarii Krishnamurthy 1958: 402 ; Compsopogon lusitanieus Reis 1977: 91 ; Compsopogon minutus Jao 1941: 5 ; Compsopogon oishii Okamura 1915: 128 ; Compsopogon prolificus Yadava and Kumano 1985 ; Compsopogon sparsus Xie and Ling 1998: 1 ; Compsopogon tenellus Xie and Ling 1998: 1 ; Compsopogonopsis leptoclados (Montagne) Krishnamurthy 1962: 219 ; Compsopogonopsis japonica Chihara 1976: 289 ( Vis et al., 1992; Necchi and Dip, 1992; Rintoul et al., 1999; Sheath and Sherwood, 2002; Kitayama, 2011; Necchi et al., 2013).

According to Necchi et al. (2013), only Compsopogon caeruleus is a correct name and other previously published species names under Compsopogon and Compsopogonopsis are synonyms.

Distribution and habit: Cosmopolitan, epilithic and epiphytic,

Africa: Algeria (Montagne, 1846); Asia: China ( Hu and Wei, 2006; Nan et al., 2016), Japan ( Kitayama, 2011), Indonesia ( Johnston et al., 2014), Vietnam ( Nguyen et al., 2013); Europe: Britain ( Sheath and Sherwood, 2011), Germany ( Täuscher, 2011); America: Florida ( Taylor, 1960), Louisiana ( Taylor, 1960), Brazil ( Nan et al., 2016); Australia: Australia ( Eloranta et al., 2011); Pacific Islands: Hawaiian Islands ( Sherwood, 2006).

Figures

Fig. 3. Morphology of Compsopogon caeruleus. A. Dried specimen (NIBRRD00000010748). B. Tufted filamentous features. C. One indi- vidual body branching. D. The non-corticated young part of body. E. Apical cell of filament. F. Uniseriate part surrounded by cortical layer. G-H. Polygonal cortical cells(arrowhead indicates monosporangia). Scale bar: B. 500μm, C. 2 mm, D-G. 50 μm, H. 100 μm.